<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <!-- import CSS -->
    <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
    <title>上传图片</title>
</head>
<body>
<div id="app">

    <el-row :gutter="2">
        <el-col :span="8">
            <div class="div-center-class">
                <div class="">
                    <center><h3>传统上传</h3></center>
                    <el-upload
                            class="upload-demo"
                            action="#"
                            drag
                            :http-request="uploadHandle">
                        <i class="el-icon-upload"></i>
                        <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
                        <div class="el-upload__tip" slot="tip">只能上传jpg/png文件，且不超过500kb</div>
                    </el-upload>
                    <div v-if="imgUrl">
                        <img :src="imgUrl" style="width: 40px;height: 40px"></img>
                    </div>
                </div>
            </div>
        </el-col>
        <el-col :span="8">
            <div class="div-center-class">
                <div class="">
                    <center><h3>前端formData直传</h3></center>
                    <el-upload
                            class="upload-demo"
                            action="#"
                            drag
                            :http-request="httpRequestHandle">
                        <i class="el-icon-upload"></i>
                        <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
                        <div class="el-upload__tip" slot="tip">只能上传jpg/png文件，且不超过500kb</div>
                    </el-upload>
                    <div v-if="directUrl">
                        <img :src="directUrl" style="width: 40px;height: 40px"></img>
                    </div>
                </div>
            </div>
        </el-col>
        <el-col :span="8">
            <div class="div-center-class">
                <div class="">
                    <center><h3>前端Url直传</h3></center>
                    <el-upload
                            class="upload-demo"
                            action="#"
                            drag
                            :http-request="UrlUploadHandle">
                        <i class="el-icon-upload"></i>
                        <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
                        <div class="el-upload__tip" slot="tip">只能上传jpg/png文件，且不超过500kb</div>
                    </el-upload>
                    <div v-if="uploadUrl">
                        <img :src="uploadUrl" style="width: 40px;height: 40px"></img>
                    </div>
                </div>
            </div>
        </el-col>
    </el-row>
</div>
</body>
<!-- import Vue before Element -->
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<!-- import JavaScript -->
<script src="https://unpkg.com/element-ui/lib/index.js"></script>
<!--import  axios -->
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<script>
    new Vue({
        el: '#app',
        data: function () {
            return {
                imgUrl: '',
                directUrl: '',
                uploadUrl:''
            }
        },
        methods: {

            uploadHandle(options) {
                let {file} = options;
                this.traditionPost(file);
            },
            traditionPost(file) {
                _that = this
                const form = new FormData();
                form.append("fileName", file.name);
                form.append("file", file);
                this.axiosPost("post", "/upload", form).then(function (res) {
                    if (res.status === 200) {
                        _that.imgUrl = res.data.data
                    } else {
                        alert("上传失败！")
                    }
                })
            },
            getpolicy(file) {
                _that = this
                axios.get('policy?fileName=' + file.name)
                    .then(function (response) {
                        let {xamzalgorithm, xamzcredential, policy, xamzsignature, xamzdate, host} = response.data.data;
                        let formData = new FormData();
                        formData.append("key", file.name);
                        formData.append("x-amz-algorithm", xamzalgorithm);  // 让服务端返回200，不设置则默认返回204。
                        formData.append("x-amz-credential", xamzcredential);
                        formData.append("policy", policy);
                        formData.append("x-amz-signature", xamzsignature);
                        formData.append("x-amz-date", xamzdate);
                        formData.append("file", file); 
                        // 发送 POST 请求
                        _that.axiosPost("post", host, formData).then(function (res) {
                            if (res.status === 204) {
                                axios.get('url?fileName=' + file.name).then(function (res) {
                                    _that.directUrl = res.data.data;
                                })
                            } else {
                                alert("上传失败！")
                            }
                        })
                    })
            },
            httpRequestHandle(options) {
                let {file} = options;
                this.getpolicy(file);
            },

            UrlUploadHandle(options) {
                let {file} = options;
                this.getUploadUrl(file);
            },
            getUploadUrl(file) {
                _that = this
                console.log(file)
                axios.get('uploadUrl?fileName=' + file.name)
                    .then(function (response) {
                        let url = response.data.data;
                        // 发送 put 请求
                        let config = {'Content-Type':file.type}
                        _that.axiosPost("put", url, file,config).then(function (res) {
                            if (res.status === 200) {
                                axios.get('url?fileName=' + file.name).then(function (res) {
                                    _that.uploadUrl = res.data.data;
                                })
                            } else {
                                alert("上传失败！")
                            }
                        })
                    })
            },
            //封装
            //axios封装post请求
            axiosPost(method, url, data,config) {
                let result = axios({
                    method: method,
                    url: url,
                    data: data,
                    headers:config
                }).then(resp => {
                    return resp
                }).catch(error => {
                    return "exception=" + error;
                });
                return result;
            }

        }
    })
</script>
<style>
    .div-center-class {
        padding: 28% 0%;
        text-align: center;
        background: beige;
    }
</style>
</html>